I saw the xp4 on ebay for ~$150 - I'm assuming that's a really good price, what do you guys think? Also, if any of you have the xp4, how much noise does it make? I saw a video on youtube of the fluval fx5 and it sounds pretty loud. What about the Rena's? any experience? Do you guys think this is a good choice for a 75 gallon tank?
Thanks


